Drafting instrument



' Feb. 1 9 1924.

c. F. GOLDEN DBAFTING INSTRUMENT 2 sheets-sheet 1 'Filed Dec. 20. 1921 atroz mq,

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Feb. 19 1924.

. C. F. GOLDEN DHAFTING iNsTRUMENT Filed Dec. 20. 1921 v 2 Sheets-Sheet 2 b ,Wm Qu mmv-n l W//, ////////,r//`

Cozdenf l Gttoznm Patented Feb. 19, 1924.

UNITED STATES PATENT oFEicE.

CHARLES FREMONT GOLDEN, or DENVEEINDIANA.

DRAFTING INSTRUMENT.

Application filed December 20, 1921. Serial No. 523,731.

The invention aims, further, to providev novel means whereby a micrometric reading may be obtained.

Other objects are, to provide novel means for mounting the stylus, to provide novel means for mounting lthe center point, an to provide novel means whereby angles may be read off in groups of minutes, as dis-v tinguishedfrom degrees. It is within the province of theI disclosure to improve generally and Vto enhance .the utility ofdevices Yof that. type to which the invention appertains. Y

With the above and other objects in view, which will appear as the-description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that, Within thescopeof what is claimed, changes in the precise embodiment of the invention shown can be made without departing from the sp-irit of the invention. l

In the accompanying drawings Figure 1 shows in plan, a tool constructed in accordance with the invention; Figure 2 is a longitudinal section taken on `the line 2-2 of Figure 1; Figure 3 is a cross section on the line 3-3 of Figure 1; Figure 4 is a rfragmfental elevation vshowing a modified form of arm; Figure 5 tion taken through the stylus holder; Figure 6 isl an end elevation of the structure shown in Figure 5; Figure 7 is a longitudinal section taken through the center point holder; Figure 8 is a'diagram illustrating certain uses of the tool. Thetool forming the subject matter of this inven- `Ation may be made of any desired material,

v tractor.

and comprises a` main member ,denoted generally by the `numeral 1, the main member being made up of a body 2 and a transverse head 3 which may be in the form of a prolline with the edge is a longitudinal sec- The fiducial edges of the body 2 are. de's'gnated by -th'e reference numerals 4 and 5, the body being provided, adjacent to the edges-4 and 5., with scales 6 which may be made in any desirediway, no specific form of scale being shown, because I amaware of the fact. that the scales may be Vmade in any preferred Way, no nove ty resulting,

as a general statement, from the use of anyy The straight Vedge knownl form of scale. 7` of 'the headV 3 is located at right angles to the edges 4'and 5. of the body 2,

tate the layingofi' of right angles. The head 3 is supplied, adjacent to the edge, 7 with av be constructed in accord-.

scale 8, Which may ance with the taste of the user or manufacturer. The `curved edge 9 of the head 3 constitutes the usual element of a protractor,

d and is supplied .with a degree scale 10, reading in opposite directionsv from a zerol point, the zero point preferably being in a under side, the body 2 has a longitudinal groove 11. They body 2 hasa longitudinal slot 12, communicating with the groove 11. A threaded opening 14 is formed in that end of the body 2 Willich is remote from the head 3. Y.

The numeral 15 denotes, generally, a carriage, mounted for adjustment on the body 2, longitudinally thereof. the carriage including a base plate 16 resting on the body 2 and having upstanding flanges 17 provided with indices 18. Openings 19 are fashioned in the flanges 17. A screwl 2O extends upwardly through the slot 12 of the body` 2 andthrough the base plate 16 ofthe carriage 15, the head 21 of the screw being housed in the groove 11 and bearing against the body 2. lA nut 22 is threaded on the screw 2O and is adapted to engage the base plate 16 of the carriage 15,-t e screw and the nut constituting aV clamping device for ho`ding the carriagel in adjusted positions on the body .2 longitudinally of ,theA

body. A vmicrometer screw 28 is mounted loosely in the openings 19 of the flanges 17. A Vmicrometer nut 24 is threaded on the screw 23 and 1s 'disposed between thel 4 of the body 3. On its to facilia tip, includingabody 43 which is polygonal in c rosssection, thebody 430i the tip the rider being provided With alaterally extended Wing 29. The rider28 has an upstanding iange 30, supplied with a. notch or seat 3l receiving the grooved portion 27 of the head 26 oi the micrometer screw 24, the micrometer screw thus being-.connected withthe rider 2S, tor rotation, but against longitudinal novementk Vvindependently of the rider. A screw 32 extends upwardly through the slot-12 of lthe body. 2,- and through thev rider 28, the screw having a hea-(i233, located in the groove'll o'thebody 2, vand Vengaging the" body. A nut 34 fis threaded on the upper end of the screw and bears upon the rider 28., the screw and the nut constituting a clamping means for holding the rider in adjusted positions on the body 2, longitudinally of the body. I.

' The rider 26 Vcarries a stylus holder 35, ivhichis av composite structure. The stylus holder comprises-a casing 36, havingare- ,duced neck 37 which is threaded at into the wing 29 oit the rider 28. The casing 36 is surmounted'by a'eap 39 provided-With a reduced neck 40 which 'isthreaded at 4l into the casingr36. The numeral 42 denotes a being disposed in the neck 3T-`ot the-casing 36, :is shown in Figure the neck 37 is provided With internal longitudinal grooves, denoted by the numeral 44,and receiving kthe longitudinal edges' 4toi-med bythe angles 43 ot' the tip 42,the'construction being such, that, although the tip can move longitudinally of the neck 37, the tip cannot'rotate With respect to the neck. The tip has atapered bore 45. A hollenv plunger 46 'is mounted for reciprocation in the cap'39 and At its lower end the plunger has a bore 47. 46 is supplied with compressible jaws 48, adapted to cooperate with the tapered bore 45 of the tip 42. Adjacent to its upper end, the plunger 46 carries an abutment 49,10-

cated Within the cap 39 and adapted to co-A operate With it, to limit the upward `movement of the plunger, under the action of a compression 'spring 50, surrounding` the plunger and locate-d in' the casing 36, the

louter end of the springl engaging the casing, and the upper end of the spring engaging the abutment 49. The loiv'erend of the punger 46 is threaded at 5l `into the body portion. 43 et the tip 42. `Since the tip 42 is stilled against rotationin the neck 37 of the casing 3 when the plunger 46 is threaded downwardly, at 5l, into the body of the tip 42, the compressible ger, cooperating'with the tapered bore 45 of the tip 42, will be compressed about the stylus, the stylus being denoted by the numeral 100. The operator may press down the plunger 46, thereby compressing the spring 50, the stylus lOO'being brought into engagement with the paperbon which the jaws 48 of the plunv drawing is to be made. yWhen theplunger 46 is released, the plunger Will move up- Wardly, responsive to the spring 50, the stylus 100 being raised with respect to the paper. Since the bore 47`opens through the-- upper. endv of the plunger 46, the stylus 16() may be inserted into the plunger, Without separating the constituent parts ol the stylus holder 35. Y

A bracket 52 is mounted on the head y3, andv into the bracket 52, the neck 53 of a casing 54 is threaded, the threading appearing at 55 in Figure 7 of the drawings. 'On the casing 54 is mounted a cap 56, having a reduced Vneck o7, threaded at 58 into the upper end of the casing. A tip 59 is provided, and has a tapered'bore 66, the tip includinga polygonal body 6l, held vfor longitudinal sliding movement, but againstl rotation, in the neck. 5'?, as hereinbefore-.expla-ined in connection with the tip 42 and its body 43. At` its'upp-erend, Vthe body 6l of the tip 59 is provided with an enlargement 6'?, adapted to cooperate with an internal shoulder 68 inthe casing 54, to. limit; the downward sliding .movement of the tip', under `the action of a compressionv spring 66, one end of thespring abutting against the element 67, and the other. end ,of the spring abutting against the cap56. `.The spring v66 surrounds a. 'hollow plunger 62 mounted to slide in thecap 56, the'plunger having a bore 63and terminating in com-V pressible jaws 65, 0 thetapered bore 60 ofthe tip 59. Theplunf ger 62 is threaded at 64 into the body 6l. ott the tip 59. A center point 69 ris located in the bore 63 of the plunger 62. Obviously by threading the plunger -62 downwardly 'fito the body 6l of the tip 59, the jawsv 65 of the plunger may be made toVv cooperate With the tapered bore 60 of the tip 59 and may be made to gripfthe center vpoint 69. The center point 69 may be inserted downwardly into the .positionshown in Figure 7., through the bore 63, because the bore opens tl'irouoh the upper ends of the plunger 62. The tip 59, therplunger 62 and the center point 69 normally aredepressed by the action of the spring66, but the operator at any time may pull the plunger 62, the tip 459 and the center point-69 upwardly, the spring 66 being compressed. g The center point 69, therefore may. be disposed out of' engagement with the paper at the will of an operator, therebyi enabling the partfGQ tobelocated properly with respect to apoint or reference. Y'

The numeral 70 marks an arm, which may be ieXible if desired, the arm having an opening 71, whereby the arm may benrounted removably on the casing 54 for swinging movement., The arm 7() has an extension 72 prolonged upon the head or protector 3, and adapted to cooperate with the screw 2O may and the rider 28 being used alone,

head 26 of the micrometer screw 23 may be fracasss scale 10 of the protractor.v The fiducial edge of the arm 70 is denoted by the-'numeral t its free end, `thearm has edges theV edges 7421s indicated at `7 5, toindicate fractions of Va degree,V in minutesor other-- wise. v

The micrometer nut 24 maybe rotated, the carriage 15 being xed on the body 2, and the rider 28 being Vslidable on the body. Through the-instrumentality ofthe nut 24 and the micrometer screw -23,.a yery line settingfor the rider 28 and 'consequently for the stylus 100, may be provided. By tightening up the nut 34v on Vthev screw 32, the rider 28 may be clamped on the body 2 in any position to which it may have been adjusted. Then, if desired, the nut 22 on the be loosened, so as `to permit a new setting of the carriage 15. If desired, the carriage l5 may be removed entirely, sincethe lifted out of the notch or seat 31 of the liange 30 in the wing 29 of the rider 28. The center point 69 is located at the intersection at t the edge 7 of the head 3, and, after the 100 has been set as aforesaid, a circle may be described, with the point 69 as a. center. If desired, the casing 54 may be detached from the bracket 32,Y the Vneck 53 being threaded into the opening 14 of the body 2, the distance then being measured from the stylus 100 toward the outer end of the body rather than from the stylus toward the head 3.

In a tool of the sort shown in this application, it is not possible to lay down any hard and fast rules relative to the method of rocedure, since a device of the sort descri ed ordinarily is committed to persons having their own methods of procedure, and capable of devising such methods as the work in hand demands. The foregoing observation should be borne in min in connection with what has been stated hereinbefore and in connection with what follows hereinafter.

Reference may be had to Figure 8, as illustrating one of the many uses for which the instrument is adapted. In Figure 8, there is shown an incomplete traverse 76, includingl lstations 77, 78 and 7 9. Let it be supposed that it is desired to continue` the plotting ofthe traverse, from the station 79. Then, the operator may, if he chooses, proceed in accordance with the following instructions.

Draw a north and south line of reference 80 through the station 79. Place the center point 69 at the station 79. Swing the tool clockwise, with the center point 69 at the station 79, until the desired degree mark 10 ie edge 4 of the body 2, and

on the protractor 3 eoincideswith the line 80. Draw a line 81 along the edge .4 ofthe body 2. l The line 81- indicatedthe azimuth in degrecs.V Swingy the body2 into an'outof-the;

way. position indicated, for instance, by the line 82.

Bring the ducial edge 73 vof the arnr70jto the vline 81. Make a marlr-83 alongone of the offset edges74 ofthe arm 70 to denote the'number of minutes designati-V.

ed bythat-partieular edge. Bring the edge 4 of the body 2 into coincidence lwith the mark l 83.and draw aline -84 from the station 79 toward themark .83, the azimuth of the next course in theV traverse'thus being lixed, whereupon the distance maybe laid .o on the scale -fwhich is adjacent to the vedge 4, the rid'er28f being used to lay oil' vthe distance if .a micrometric V'reading is desired.

Suppose that it is desired to determine the angle between two lines, e. g. the line and a line 85. Then the center point 69 is placed at the station 79,-the edge'4 of the body 2 is made to coincide with the line 80, the fiducial dence with the line 85, and the angle is read'y off in degrees on the scale 10 lof the provtractor 3, by means of the extension 72 of the arm 70.

InY operations which do not call for a read.h ing determined by the relation existing between the arm and the scale 10 of the protractor 3, an arm 86 may be used, the arm having an opening 87- for the reception of the part 54, the extension 72 being omitted. Such an arm as the member 86 may be used to plot the traverse course shown at 84 and hereinbefore described. j

Having thus described the invention, what is claimed is:

1. In a tool of the class described, a main member; a center point carried by the main member; a stylus holder; means for mounting the stylus holder on the main member and means for micrometric adjustment of said holder with respect to the center point.

2. In a tool of the class described, a main member; a center point carried by the main member; spring Vmeans for advancing the center point; means under the control of an operator for retracting the center point; a stylus holder; means for mounting the stylusy holder on the main member and means for micrometric adjustment of said holder with respect to the center point.

3. In a tool of the class described, a main member; acenter point carried byl the main member; a stylus holder; means for mounting the stylus holder on said main member advancing the center point on the main member; Vmechanism under the control vof an operator for .retractingi the center point on the main member; astylus holder; means fory mounting the stylus holderion the main mem.

. the stylus holder.

5. In a device of the class described, a main member; a carriage adjustable on the main member; a rider adjustable on the main member; a stylus holder carried by the rider; a micrometer mechanism forming a connection between the carriage and the rider; means for holdingthe carriage in adjusted positions on the main member; and means for holding the rider in adjusted positions on themain member. j I

6. In a-device' of the class described, amain on said member and connectedlwith said holder, means for holding said'meehanism in adjustedposition on said member, and means for holding the holdingmeansiinadjustedposition. y Y v Y In testimony that I claim the foregoingfas my own, IV have hereto aHiXed my signature in the presenceof two witnesses.

CHARLES FREMONT GOLDEN.

- Vit-nesses:

J. W. NEWELL, CHAs. O. ToMHooF.

jmember; a stylusV holder adjustable Vonf'saidl member, micrometer .mechanism adjustable 

